package com.xian.d2_static_util;

public class TestDemo2 {
    public static void main(String[] args) {
        int[] arr = null;
        int[] arr1 = {};
        int[] arr2 = {10,20,30,40};
        System.out.println(ArrayUtil.toString(arr));  //null
        System.out.println(ArrayUtil.toString(arr1)); //[]
        System.out.println(ArrayUtil.toString(arr2)); //[10,20,30,40]
    }
}
